Linked Life Data

14523009

Source:http://linkedlifedata.com/resource/pubmed/id/14523009

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
50
pubmed:dateCreated
2003-12-8
pubmed:abstractText
Subjecting myogenic H9c2 cells to transient energy deprivation leads to a caspase-independent death with typical features of necrosis. Here we show that the rupture of cytoplasmic membrane, the terminal event in necrosis, is shortly preceded by rapid depolarization of mitochondrial membranes. The rapid deenergization of mitochondria critically depended upon prior generation of reactive oxygen species (ROS) during ATP depletion stage. Accordingly, expression of catalase prevented mitochondrial depolarization and averted subsequent necrosis. Interestingly, trifluoperazine, a compound that protects cells from ischemic insults, prevented necrosis of H9c2 cells through inhibition of ROS production. Other factors that regulated the mitochondrial membrane depolarization and subsequent loss of plasma membrane integrity include a stress kinase JNK activated at early steps of recovery from ATP depletion, as well as an apoptotic inhibitory protein ARC. Accordingly, inhibition of JNK or overexpression of ARC prevented mitochondrial depolarization and rescued H9c2 cells from necrosis. ROS and JNK affected mitochondrial deenergization and necrosis independently of each other since inhibition of ROS production did not prevent activation of JNK, whereas inhibition of JNK did not suppress ROS accumulation. Therefore, JNK activation and ROS production represent two independent pathways that control mitochondrial depolarization and subsequent necrosis of cells subjected to transient energy deprivation. Overexpression of ARC, although preventing mitochondrial depolarization, did not affect either JNK activation or production of ROS. The major heat shock protein Hsp72 inhibited JNK-related steps of necrotic pathway but did not affect ROS accumulation. Interestingly, mitochondrial depolarization and subsequent necrosis can be suppressed by an Hsp72 mutant Hsp72DeltaEEVD, which lacks chaperone function but can efficiently suppress JNK activation. Thus, Hsp72 is directly implicated in a signaling pathway, which leads to necrotic death.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
12
pubmed:volume
278
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
50483-96
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed-meshheading:14523009-Adenosine Triphosphate, pubmed-meshheading:14523009-Adenoviridae, pubmed-meshheading:14523009-Animals, pubmed-meshheading:14523009-Apoptosis, pubmed-meshheading:14523009-Apoptosis Regulatory Proteins, pubmed-meshheading:14523009-Blotting, Western, pubmed-meshheading:14523009-Cell Line, pubmed-meshheading:14523009-Cytoplasm, pubmed-meshheading:14523009-Dose-Response Relationship, Drug, pubmed-meshheading:14523009-HSP70 Heat-Shock Proteins, pubmed-meshheading:14523009-Immunohistochemistry, pubmed-meshheading:14523009-Intracellular Membranes, pubmed-meshheading:14523009-JNK Mitogen-Activated Protein Kinases, pubmed-meshheading:14523009-MAP Kinase Kinase 4, pubmed-meshheading:14523009-Microscopy, Fluorescence, pubmed-meshheading:14523009-Mitochondria, pubmed-meshheading:14523009-Mitogen-Activated Protein Kinase Kinases, pubmed-meshheading:14523009-Models, Biological, pubmed-meshheading:14523009-Muscle Proteins, pubmed-meshheading:14523009-Mutation, pubmed-meshheading:14523009-Myocardium, pubmed-meshheading:14523009-Necrosis, pubmed-meshheading:14523009-Rats, pubmed-meshheading:14523009-Reactive Oxygen Species, pubmed-meshheading:14523009-Signal Transduction, pubmed-meshheading:14523009-Time Factors
pubmed:year
2003
pubmed:articleTitle
Regulation of necrosis of H9c2 myogenic cells upon transient energy deprivation. Rapid deenergization of mitochondria precedes necrosis and is controlled by reactive oxygen species, stress kinase JNK, HSP72 and ARC.
pubmed:affiliation
Department of Biochemistry, Boston University School of Medicine Boston, Massachusetts 02118, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't